CN105884051B - A kind of prodan/potassium efficient scale inhibitor and preparation method thereof - Google Patents

Abstract

The invention provides a sodium fluorosilicate/potassium high-efficiency scale inhibitor and a preparation method thereof. The scale inhibitor consists of 100 parts of melamine hexamethylene phosphonic acid and 1-50 parts of OP-10 emulsifier or polyethylene glycol or twelve Sodium alkyl sulfonate is mixed and compounded, and its preparation method is divided into two steps: the first step is to prepare melamine hexamethylene phosphine by reacting hexamethylol melamine and phosphorous acid in a molar ratio of 1:6‑10 under acidic conditions acid, the second step is to mix melamine hexamethylene phosphonic acid with OP-10 emulsifier or polyethylene glycol or sodium laurylsulfonate according to the ratio of parts by weight of 100:1-50. The synthesis process of the antiscalant is simple and the performance is stable. Compared with traditional antiscalants, it has the advantages of less addition and lower cost. It has excellent antiscaling effect on CaSO ₄ , especially Na ₂ SiF ₆ (K ₂ SiF ₆ ), It also has a certain descaling effect on CaCO ₃ and has a very broad application prospect.

Description

A kind of sodium fluorosilicate/potassium high-efficiency scale inhibitor and preparation method thereof

technical field

The invention belongs to the technical field of industrial scale inhibition, and in particular relates to a sodium/potassium fluorosilicate high-efficiency scale inhibitor and a preparation method thereof.

Background technique

In recent years, with the rapid development of my country's industrial production, industrial water consumption has risen sharply, and the mineral content in water will also continue to increase, which will cause scaling and corrosion of equipment and pipelines. The presence of dirt will not only affect the heat transfer efficiency, but also cause under-deposit corrosion. At present, a major process problem common in the production of wet-process phosphoric acid is that the potassium fluorosilicate (sodium) in the vacuum filtration system is fouled and causes blockage, especially for manufacturers who use phosphate rock with high potassium and sodium content as raw materials. And the production schedule is greatly affected. Putting antiscalants into water can effectively control the formation and deposition of scales, so it is necessary to delay or inhibit the formation of scales by adding antiscalants.

Methylene phosphonic acid compound is one of the earliest applied agents in water treatment, because it can form multi-nuclear complexes (soft scale) with ^{Ca 2+} , Mg ²⁺ , Zn ²⁺ , Fe ²⁺ and other metal ions in water. Exhaust the system, or adsorb on the crystal growth point of the scale, inhibit the further growth of the scale, so as to achieve the effect of scale inhibition. In the anti-scaling treatment of industrial cooling water, methylene phosphonic acid type compounds have excellent anti-scaling effect on calcium carbonate and calcium sulfate, and have been widely used. In view of the scaling in industrial cooling water and in the production of wet-process phosphoric acid, it is due to the change of liquid phase properties such as temperature and concentration, which increases the saturation, and is formed through processes such as nucleation, crystal growth, and deposition on the contact surface. Therefore, the methylene phosphonic acid scale inhibitor also has a certain inhibitory effect on the potassium (sodium) fluorosilicate scale in the production of wet-process phosphoric acid. At present, more researches are on compound antiscalants, which refers to the simultaneous use of two or more antiscalants. The compound antiscalant can significantly improve the use efficiency of the agent by taking advantage of its synergistic effect.

Contents of the invention

The purpose of the present invention is to solve the deficiencies such as poor pertinence and poor effect of the scale remover in the existing wet-process phosphoric acid production, and to provide a sodium/potassium fluorosilicate high-efficiency scale inhibitor and its preparation method. The agent has simple synthesis process and stable performance, and has excellent scale inhibition effect on various scales, especially sodium/potassium fluorosilicate in wet-process phosphoric acid production.

The technical scheme that the present invention solves the above problems is as follows:

A sodium/potassium fluorosilicate high-efficiency scale inhibitor is prepared by mixing 100 parts by weight of melamine hexamethylene phosphonic acid and 1-50 parts of nonionic surfactant.

Described nonionic surfactant is a kind of in OP-10 emulsifying agent, polyethylene glycol, sodium lauryl sulfonate, and described melamine hexamethylene phosphonic acid structural formula is

The preparation method of the above-mentioned sodium fluorosilicate/potassium high-efficiency scale inhibitor comprises the following steps: firstly, melamine hexamethylene phosphonic acid is prepared by reacting hexamethylol melamine and phosphorous acid under acidic conditions, and melamine hexamethylene phosphonic acid and nonionic Surfactants are mixed evenly in a certain proportion.

In the above scheme, when preparing melamine hexamethylene phosphonic acid, first dissolve a certain amount of phosphorous acid in water to prepare a solution, then add the phosphorous acid aqueous solution dropwise to the mixed solution of hexamethylolmelamine and hydrochloric acid, and heat the solution to 90 Stir and react at -100°C for 6-16 hours. After the reaction is completed, cool and stand still, then add absolute ethanol and stir for 1-2 hours, then filter, wash and dry to obtain the product.

In the above scheme, the molar ratio of hexamethylolmelamine to phosphorous acid is 1:6-10.

In the above scheme, the ratio by weight of melamine hexamethylene phosphonic acid to the nonionic surfactant is 100:1-50.

The nonionic surfactant is one of OP-10 emulsifier, polyethylene glycol and sodium dodecylsulfonate.

Preferably, the molar ratio of hexamethylolmelamine to phosphorous acid is 1:10, and the nonionic surfactant is OP-10 emulsifier.

The sodium/potassium fluorosilicate high-efficiency scale inhibitor provided by the invention has the following beneficial effects: (1) stable performance and simple synthesis process. (2) Compared with traditional antiscalants, the addition amount is less, and the use cost is low. (3) It has excellent scale inhibition effect on CaSO ₄ , especially Na ₂ SiF ₆ (K ₂ SiF ₆ ), and has certain scale removal effect on CaCO ₃ . Specifically, for sodium fluorosilicate/potassium scale, when the dosage of the scale inhibitor is only 80ppm, the scale inhibition rate can reach more than 95%, and for calcium sulfate scale, the dosage of the scale inhibitor is only 8mg/L When the dosage of scale inhibitor is 16mg/L, the scale inhibition rate can reach more than 98%. For calcium carbonate scale, the scale inhibition rate can reach more than 84%.

Description of drawings

Figure 1 is the mass spectrum of the melamine hexamethylene phosphonic acid scale inhibitor main agent prepared in Example 1 of the present invention.

Detailed ways

In order to enable those skilled in the art to fully understand the technical solutions and beneficial effects of the present invention, further description will be given below in conjunction with specific embodiments and accompanying drawings.

Example 1

A sodium/potassium fluorosilicate high-efficiency scale inhibitor, which is formed by mixing 100 parts of melamine hexamethylene phosphonic acid and 25 parts of OP-10 emulsifier, and its preparation method is as follows:

Step 1: Dissolve 15 g of phosphorous acid (0.18 mol) in 40 ml of deionized water to obtain an aqueous phosphorous acid solution for later use. Add 9.3g of hexamethylolmelamine (0.03mol), 17ml concentration of 37wt% hydrochloric acid solution in the reaction vessel with stirring device, thermometer and reflux condensing device, and all the phosphorous acid aqueous solution prepared is added dropwise in the reactor , After the dropwise addition, the temperature was raised to 100°C, and the reaction was stirred for 10h. After the reaction, the solution was cooled and stood still, absolute ethanol was added therein and stirred for 1-2 h, and a white solid was precipitated. Finally, after suction filtration, alcohol washing (2-3 times of absolute ethanol washing) and vacuum drying, 19.4 g of white solid was obtained, which was the main agent of melamine hexamethylene phosphonic acid scale inhibitor.

Step 2: According to the ratio of parts by weight, take 100 parts of melamine hexamethylene phosphonic acid scale inhibitor and 25 parts of OP-10 emulsifier into the blending kettle, and stir at room temperature for 30-60 minutes to obtain sodium fluorosilicate / Potassium efficient scale inhibitor.

The molecular structural formula of the main agent of melamine hexamethylene phosphonic acid scale inhibitor prepared in the first step is

Its mass spectrum is shown in Figure 1. It can be seen from Figure 1 that the molecular ion peak at 691.07m/z is the molecular ion peak of the scale inhibitor main agent molecule, and the relative abundance is 100%, which can prove that the target product is melamine hexamethylene phosphonic acid scale inhibitor main agent.

Example 2

A sodium fluorosilicate/potassium high-efficiency scale inhibitor, which is formed by mixing 100 parts of melamine hexamethylene phosphonic acid and 25 parts of polyethylene glycol, and its preparation method is as follows:

Step 1: Dissolve 54 g of phosphorous acid (0.66 mol) in 100 ml of deionized water to obtain an aqueous phosphorous acid solution for later use. Add 28.9g hexamethylolmelamine (0.09mol) and 50ml concentration of 37wt% hydrochloric acid solution to the reaction vessel with stirring device, thermometer and reflux condensing device, and add all the prepared aqueous phosphorous acid solution dropwise into the reactor , After the dropwise addition, the temperature was raised to 100°C, and the reaction was stirred for 10h. After the reaction, the solution was cooled and stood still, absolute ethanol was added therein and stirred for 1-2 h, and a white solid was precipitated. Finally, after suction filtration, alcohol washing (2-3 times of absolute ethanol washing) and vacuum drying, 58.8 g of white solid was obtained, which was the main agent of melamine hexamethylene phosphonic acid scale inhibitor.

The second step: according to the ratio of parts by weight, take 100 parts of melamine hexamethylene phosphonic acid scale inhibitor and 25 parts of polyethylene glycol into the blending kettle, and stir at room temperature for 30-60 minutes to obtain sodium fluorosilicate/ Potassium efficient antiscalant.

Example 3

A sodium fluorosilicate/potassium high-efficiency scale inhibitor, which is formed by mixing 100 parts of melamine hexamethylene phosphonic acid and 25 parts of sodium dodecylbenzenesulfonate, and its preparation method is as follows:

Step 1: Dissolve 117 g of phosphorous acid (1.43 mol) in 100 ml of deionized water to obtain an aqueous phosphorous acid solution for later use. Add 54.5g of hexamethylolmelamine (0.18mol), 70ml concentration of 37wt% hydrochloric acid solution in the reaction vessel with stirring device, thermometer and reflux condensing device, and all the phosphorous acid aqueous solution prepared is added dropwise in the reactor , After the dropwise addition, the temperature was raised to 90°C, and the reaction was stirred for 16h. After the reaction, the solution was cooled and stood still, absolute ethanol was added thereto and stirred for 2 h, and a white solid was precipitated. Finally, after suction filtration, alcohol washing (washing with absolute ethanol 2-3 times) and vacuum drying, 110.6 g of white solid was obtained, which was the main agent of melamine hexamethylene phosphonic acid scale inhibitor.

The second step: according to the ratio of parts by weight, take 100 parts of melamine hexamethylene phosphonic acid scale inhibitor and 25 parts of sodium dodecylbenzene sulfonate into the blending kettle, and stir at room temperature for 30-60 minutes to obtain fluorine Sodium silicate/potassium high-efficiency scale inhibitor.

Example 4

A sodium/potassium fluorosilicate high-efficiency scale inhibitor, which is prepared by mixing 100 parts of melamine hexamethylene phosphonic acid and 1 part of OP-10 emulsifier, and its preparation method is as follows:

Step 1: Dissolve 147.6 g (1.8 mol) of phosphorous acid in 120 ml of deionized water to obtain an aqueous phosphorous acid solution for later use. Add 54.5g (0.18mol) hexamethylol melamine, 80ml concentration and be 37wt% hydrochloric acid solution in the reaction vessel with stirring device, thermometer and reflux condensing device, the phosphorous acid aqueous solution that will prepare is all added dropwise in the reactor , After the dropwise addition, the temperature was raised to 95°C, and the reaction was stirred for 6h. After the reaction, the solution was cooled and stood still, absolute ethanol was added thereto and stirred for 2 h, and a white solid was precipitated. Finally, after suction filtration, alcohol washing (washing with absolute ethanol 2-3 times) and vacuum drying, 113 g of white solid was obtained, which was the main antiscalant agent of melamine hexamethylene phosphonic acid.

Step 2: According to the ratio of parts by weight, take 100 parts of melamine hexamethylene phosphonic acid scale inhibitor and 1 part of OP-10 emulsifier into the blending kettle, and stir at room temperature for 30-60 minutes to obtain sodium fluorosilicate / Potassium efficient scale inhibitor.

Example 5

A sodium fluorosilicate/potassium high-efficiency scale inhibitor, which is formed by mixing 100 parts of melamine hexamethylene phosphonic acid and 1 part of polyethylene glycol, and its preparation method is as follows:

Step 1: Dissolve 54 g of phosphorous acid (0.66 mol) in 100 ml of deionized water to obtain an aqueous phosphorous acid solution for later use. Add 28.9g hexamethylolmelamine (0.09mol) and 50ml concentration of 37wt% hydrochloric acid solution to the reaction vessel with stirring device, thermometer and reflux condensing device, and add all the prepared aqueous phosphorous acid solution dropwise into the reactor , After the dropwise addition, the temperature was raised to 100°C, and the reaction was stirred for 10h. After the reaction, the solution was cooled and stood still, absolute ethanol was added therein and stirred for 1-2 h, and a white solid was precipitated. Finally, after suction filtration, alcohol washing (2-3 times of absolute ethanol washing) and vacuum drying, 58.8 g of white solid was obtained, which was the main agent of melamine hexamethylene phosphonic acid scale inhibitor.

The second step: according to the ratio of parts by weight, take 100 parts of melamine hexamethylene phosphonic acid scale inhibitor and 1 part of polyethylene glycol into the blending kettle, and stir at room temperature for 30-60 minutes to obtain sodium fluorosilicate/ Potassium efficient antiscalant.

Example 6

A sodium fluorosilicate/potassium high-efficiency scale inhibitor, which is formed by mixing 100 parts of melamine hexamethylene phosphonic acid and 1 part of sodium dodecylbenzenesulfonate, and its preparation method is as follows:

Step 1: Dissolve 117 g of phosphorous acid (1.43 mol) in 100 ml of deionized water to obtain an aqueous phosphorous acid solution for later use. Add 54.5g of hexamethylolmelamine (0.18mol), 70ml concentration of 37wt% hydrochloric acid solution in the reaction vessel with stirring device, thermometer and reflux condensing device, and all the phosphorous acid aqueous solution prepared is added dropwise in the reactor , After the dropwise addition, the temperature was raised to 90°C, and the reaction was stirred for 16h. After the reaction, the solution was cooled and stood still, absolute ethanol was added thereto and stirred for 2 h, and a white solid was precipitated. Finally, after suction filtration, alcohol washing (washing with absolute ethanol 2-3 times) and vacuum drying, 110.6 g of white solid was obtained, which was the main agent of melamine hexamethylene phosphonic acid scale inhibitor.

Step 2: According to the ratio of parts by weight, take 100 parts of melamine hexamethylene phosphonic acid scale inhibitor and 1 part of sodium dodecylbenzene sulfonate into the blending kettle, and stir at room temperature for 30-60 minutes to obtain fluorine Sodium silicate/potassium high-efficiency scale inhibitor.

Example 7

A sodium/potassium fluorosilicate high-efficiency scale inhibitor, which is compounded by 100 parts of melamine hexamethylene phosphonic acid and 50 parts of OP-10 emulsifier, and its preparation method is as follows:

Step 1: Dissolve 15 g of phosphorous acid (0.18 mol) in 40 ml of deionized water to obtain an aqueous phosphorous acid solution for later use. Add 9.3g of hexamethylolmelamine (0.03mol), 17ml concentration of 37wt% hydrochloric acid solution in the reaction vessel with stirring device, thermometer and reflux condensing device, and all the phosphorous acid aqueous solution prepared is added dropwise in the reactor , After the dropwise addition, the temperature was raised to 100°C, and the reaction was stirred for 10h. After the reaction, the solution was cooled and stood still, absolute ethanol was added therein and stirred for 1-2 h, and a white solid was precipitated. Finally, after suction filtration, alcohol washing (2-3 times of absolute ethanol washing) and vacuum drying, 19.4 g of white solid was obtained, which was the main agent of melamine hexamethylene phosphonic acid scale inhibitor.

Step 2: According to the ratio of parts by weight, take 100 parts of melamine hexamethylene phosphonic acid scale inhibitor and 50 parts of OP-10 emulsifier into the blending kettle, and stir at room temperature for 30-60 minutes to obtain sodium fluorosilicate / Potassium efficient scale inhibitor.

Example 8

A sodium fluorosilicate/potassium high-efficiency scale inhibitor, which is formed by mixing 100 parts of melamine hexamethylene phosphonic acid and 50 parts of polyethylene glycol, and its preparation method is as follows:

Step 1: Dissolve 54 g of phosphorous acid (0.66 mol) in 100 ml of deionized water to obtain an aqueous phosphorous acid solution for later use. Add 28.9g hexamethylolmelamine (0.09mol) and 50ml concentration of 37wt% hydrochloric acid solution to the reaction vessel with stirring device, thermometer and reflux condensing device, and add all the prepared aqueous phosphorous acid solution dropwise into the reactor , After the dropwise addition, the temperature was raised to 100°C, and the reaction was stirred for 10h. After the reaction, the solution was cooled and stood still, absolute ethanol was added therein and stirred for 1-2 h, and a white solid was precipitated. Finally, after suction filtration, alcohol washing (2-3 times of absolute ethanol washing) and vacuum drying, 58.8 g of white solid was obtained, which was the main agent of melamine hexamethylene phosphonic acid scale inhibitor.

The second step: according to the ratio of parts by weight, take 100 parts of melamine hexamethylene phosphonic acid scale inhibitor and 50 parts of polyethylene glycol into the blending kettle, and stir at room temperature for 30-60 minutes to obtain sodium fluorosilicate/ Potassium efficient antiscalant.

Example 9

A sodium fluorosilicate/potassium high-efficiency scale inhibitor, which is formed by mixing 100 parts of melamine hexamethylene phosphonic acid and 50 parts of sodium dodecylbenzenesulfonate, and its preparation method is as follows:

Step 1: Dissolve 117 g of phosphorous acid (1.43 mol) in 100 ml of deionized water to obtain an aqueous phosphorous acid solution for later use. Add 54.5g of hexamethylolmelamine (0.18mol), 70ml concentration of 37wt% hydrochloric acid solution in the reaction vessel with stirring device, thermometer and reflux condensing device, and all the phosphorous acid aqueous solution prepared is added dropwise in the reactor , After the dropwise addition, the temperature was raised to 90°C, and the reaction was stirred for 16h. After the reaction, the solution was cooled and stood still, absolute ethanol was added thereto and stirred for 2 h, and a white solid was precipitated. Finally, after suction filtration, alcohol washing (washing with absolute ethanol 2-3 times) and vacuum drying, 110.6 g of white solid was obtained, which was the main agent of melamine hexamethylene phosphonic acid scale inhibitor.

Step 2: According to the ratio of parts by weight, take 100 parts of melamine hexamethylene phosphonic acid scale inhibitor and 50 parts of sodium dodecylbenzene sulfonate into the blending kettle, and stir at room temperature for 30-60 minutes to obtain fluorine Sodium silicate/potassium high-efficiency scale inhibitor.

In order to fully understand the actual effects of the scale inhibitors prepared in Examples 1-3 of the present invention, the scale inhibition experiments of sodium/potassium fluorosilicate, calcium sulfate and calcium carbonate were carried out respectively. The present invention simulates the sodium fluorosilicate/potassium scale inhibition experimental method of industrial wet-process phosphoric acid production process as follows:

Heat the dilute phosphoric acid solution retrieved from the wet-process phosphoric acid production site to 75°C, transfer it to five 250ml beakers while hot, add scale inhibitor in proportion and place it in a constant temperature water bath at 50°C for 48 hours. The scale inhibitors added to the beaker were 40ppm, 80ppm, 120ppm, and 160ppm in terms of dilute acid, and a blank control was carried out at the same time. By measuring the content of K ⁺ and Na ⁺ in the solution before and after adding the scale inhibitor, the scale inhibition rate (η) is calculated by the following formula

In the formula: C ₀ ——concentration of K ⁺ and Na ⁺ in the acid solution before heat preservation, mg/L;

C ₁ ——Concentration of K ⁺ and Na ⁺ in the test group without antiscalant after heat preservation, mg/L;

C ₂ ——Concentration of K ⁺ and Na ⁺ in the test group with antiscalant added after heat preservation, mg/L.

The scale inhibition test of calcium sulfate and calcium carbonate was carried out with reference to the method in "Evaluation Method of Antiscalant Agents for Oilfields" (SY/T 5673-93), and the scale inhibition rate of calcium sulfate and calcium carbonate was tested respectively, and the scale inhibition rate was calculated. Table 1 shows the scale inhibition test results of the scale inhibitor sodium/potassium fluorosilicate prepared in Examples 1-3.

Table 1: Scale inhibition performance evaluation of sodium/potassium fluorosilicate

As can be seen from Table 1, when the dosage of the scale inhibitor prepared in Example 1 of the present invention is 80ppm, the scale inhibition rate can reach more than 95%; when the dosage of the scale inhibitor prepared in Example 2 is 160ppm, the scale inhibition rate The scale inhibition rate can reach the maximum, which is more than 80%; when the dosage of the scale inhibitor prepared in Example 3 is 120ppm, the scale inhibition rate can reach the maximum, which is more than 87%. After comparison, it is found that the scale inhibitor prepared in Example 1 has the best scale inhibition effect on sodium fluorosilicate (potassium), and the addition amount is the least, which is the optimal formula; secondly, the scale inhibitor prepared in Example 3 has better scale inhibition effect than Example 2.

Table 2 shows the scale inhibition test results of the scale inhibitor calcium sulfate prepared in Examples 1-3.

Table 2: Calcium sulfate scale inhibition performance evaluation

As can be seen from Table 2, when the dosage of the scale inhibitor prepared in Example 1 of the present invention is 8mg/L, the scale inhibition rate can reach more than 98%; when the dosage of the scale inhibitor prepared in Example 2 is 25mg/L When L, the scale inhibition rate can reach the maximum, which is more than 93%; when the dosage of the scale inhibitor prepared in Example 3 is 40mg/L, the scale inhibition rate can reach the maximum, which is more than 88%. After comparison, it is found that the scale inhibitor prepared in Example 1 has the best scale inhibition effect on calcium sulfate, and the addition amount is the least, which is the optimal formula; secondly, the scale inhibitor prepared in Example 2 has better scale inhibition effect than Example 3.

Table 3 shows the scale inhibition test results of the scale inhibitor calcium carbonate prepared in Examples 1-3.

Table 3: Calcium carbonate scale inhibition performance evaluation

It can be seen from Table 3 that the scale inhibition rate of the scale inhibitor prepared in Example 1 of the present invention increases as the dosage increases. When the dosage is 40mg/L, the scale inhibition rate is the largest, reaching 78% or more; when the dosage of the scale inhibitor prepared in Example 2 is 25mg/L, the scale inhibition rate can reach more than 83%; when the dosage of the scale inhibitor prepared in Example 3 is only 16mg/L, the scale inhibition rate The rate can reach the maximum, which is more than 84%; through comparison, it is found that the scale inhibitor prepared in Example 3 has the best scale inhibition effect on calcium carbonate, and the addition amount is the least, which is the optimal formula; followed by the scale inhibitor prepared in Example 2 The anti-scaling effect is better than that of Example 1.

The above-mentioned experimental results show that the scale inhibitor provided by the present invention has excellent scale inhibition effect on calcium sulfate, especially sodium fluorosilicate (potassium), requires less dosage, and has certain scale removal effect on calcium carbonate. It has broad application prospects.

Claims (6)

1. A sodium fluorosilicate/potassium high-efficiency scale inhibitor, characterized in that the high-efficiency scale inhibitor is compounded by mixing 100 parts by weight of melamine hexamethylene phosphonic acid and 1-50 parts of nonionic surfactant Form; described nonionic surfactant is a kind of in OP-10 emulsifying agent, Polyethylene Glycol, sodium lauryl sulfonate, and described melamine hexamethylene phosphonic acid structural formula is 2. the preparation method of sodium fluorosilicate/potassium high-efficiency scale inhibitor as claimed in claim 1, is characterized in that, comprises the following steps: Firstly, melamine hexamethylene phosphonic acid is prepared by reacting hexamethylol melamine and phosphorous acid under acidic conditions, and then the melamine hexamethylene phosphonic acid and nonionic surfactant are uniformly mixed in a certain proportion to obtain final product; When preparing melamine hexamethylene phosphonic acid, first dissolve a certain amount of phosphorous acid in water to prepare a solution, then add the phosphorous acid aqueous solution dropwise into the mixed solution of hexamethylolmelamine and hydrochloric acid, and then heat the solution to 90-100 Stir and react at ℃ for 6-16 hours, after the reaction is completed, cool and stand still, then add absolute ethanol and stir for 1-2 hours, then filter, wash and dry to obtain the product. 3. The preparation method of sodium fluorosilicate/potassium high-efficiency scale inhibitor as claimed in claim 2, characterized in that: the molar ratio of hexamethylolmelamine to phosphorous acid is 1:6-10. 4. The preparation method of sodium fluorosilicate/potassium high-efficiency scale inhibitor as claimed in claim 2, characterized in that: the ratio by weight of melamine hexamethylene phosphonic acid to nonionic surfactant is 100:1-50. 5. The preparation method of sodium fluorosilicate/potassium high-efficiency scale inhibitor as claimed in claim 2, is characterized in that: the nonionic surfactant is OP-10 emulsifier, polyethylene glycol, lauryl One of sodium sulfonate. 6. The preparation method of sodium fluorosilicate/potassium high-efficiency scale inhibitor as claimed in claim 2, is characterized in that: the mol ratio of hexamethylolmelamine and phosphorous acid is 1:10, and the nonionic surfactant It is OP-10 emulsifier.